未将对象引用设置到对象的实例。

在 uultJR1RYEJ4BUdQvME.zsA5E1Ty21(Object , uultJR1RYEJ4BUdQvME )
在 MT4APIGD.Zzh.EArl6nRNgL(Int32 )
在 pTXhwmdHoQNBxwvEGpa.zsA5E1Ty21(Object , Int32 hdtk, pTXhwmdHoQNBxwvEGpa )
在 MT4APIGD.Zzh.RlMltsjApS(Object , RoutedPropertyChangedEventArgs`1 )
在 System.Windows.RoutedPropertyChangedEventArgs`1.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
在 System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
在 System.Windows.Controls.TreeView.OnSelectedItemChanged(RoutedPropertyChangedEventArgs`1 e)
在 System.Windows.Controls.TreeView.ChangeSelection(Object data, TreeViewItem container, Boolean selected)
在 System.Windows.Controls.TreeViewItem.Select(Boolean selected)
在 System.Windows.Controls.TreeViewItem.OnIsSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
在 System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
在 System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
在 System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
在 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry